Be selective in who you buy links from, as most of the link power from forums seems to be in HUMAN traffic. High quality members will offer you more in the end then high quantity members, so... Buying sig links? Read this first! If you are going to be doing the posting yourself, then check out this thread: Forum Link Building tips (it's not just your signiture!) Though, if you are in it for nothing but quantity, then look beyond the BIG boards and get a BUNCH of little ones. They are cheaper and have the potential to offer a wider range of links.
I have really used my forum signatures to drive some traffic, network, and get some PR juice. The PR juice isn't that great and you also have to make sure google is indexing all pages of the blog to.
In the eyes of a bot, they may be equal... however, it's not all that hard to discount any links after ___________ in a post A link in the reply has a LOT more exposure with humans. Most of us forum goers have sig blindness, though nearly ALL of us read the posts
Hello You can also use this http://forums.sharmainfoway.com/ Signature links are active from the day one you start discussions. No need to wait like DP.